Vivier



(No Model.)

R. FULLER. BRUSH HOLDER FOR DYNAMO ELECTRIC MACHINES. No. 522,051.

Patented June 26, 1894.

YHE NAnoNAL LlmoanAPmm:

UNITED STATES PATENT OFFICE.

LOUIS JEAN MARIE DUVIVIER, OF NEVERS, FRANCE.

MOVABLE KEYBOARD.

SPECIFICATION forming part of Letters Patent No. 522,048, dated June 26,1894.

Application filed June 10, 1893. Serial No. 477,185. (No model.)

To all whom it may concern.-

Be it known that 1, Louis JEAN MARIE DU- VIVIER, fabricant, a citizen ofthe Republic of France, residing in Nevers, (Nivre) France, haveinvented a Movable Keyboard Applicable to Double Basses and Bass-Violsor Violoncellos, of which the following is a specification.

The invention forming the object of the present invention relates to amovable keyboard applicable to double basses and bass viols orvioloncellos and designed to facilitate the study, holding and playingof these instruments. This keyboard is represented in the annexeddrawings, in which Figure 1 represents a transverse section of the saidkeyboard. Fig. 2 is a plan showing the distribution or arrangement ofthe keys. Fig. 3 is a perspective view of the whole of a double basshaving the keyboard in question placed upon its neck. Fig. 4: is a sideelevation and front view of a trestle employed to support the doublebass when the keyboard is employed. Fig. 5 represents in plan and sideelevation a support for preventing the bridge from being forced over andthrown down by the action of the pressing pieces or dampers worked bythe keyboard. Fig. 6 illustrates a detail of the mode of suspending thebow underneath the keyboard. Fig. 7 is a detail view of the reed box.

The keyboard in question is formed by a box A in which is inclosed aseries of keys B pivoted on a bearer a. and having their tail endsconnected by rods or wires b of adjustable length to levers O pivoted at0 whose extremities being provided with pressing pieces or dampers p arerespectively opposite to the strings 1, 2, 3, of the instrument the neckD of which fits into a recess in the lower part A of the box A. Springs7' fixed on the bearer a and pressing against a stop or shoulder 1) onthe wires b constantly tend to cause the keys B to return to theirnormal position and move the levers C out of contact with the strings ofthe instrument. A glazed lid or cover E hinged at 2 covers the keys Band protects the mechanism from dust when the instrument is not in use.

The keyboard proper is of limited length oc-y (see dotted lines Fig. 2)while the levers C diverge and form several layers crossing one anotherso as to reach the strings 1, Zand 3 at the points where they require topress them down and shorten them in accordance with the sounds to beproduced. The dampers 19 are covered with leather and are of differentshapes corresponding to the lovers O to which they belong and accordingto the plane or position of the latter relatively to the strings. Undereach of these strings opposite to the dampers a strip of leather isglued to the neck D in order that the strings may be held down properly.

At the upper part of the box A, Figs. 1 and 7, there may be provided asmall box F containing as many free reeds m as there are keys on thekeyboard. Each reed cell is provided with a valve which is raised toallow the wind from a bellows (which bellows may be operated by a pedaladapted for the purpose) to pass through the cell and act upon the reed.Rods f connect the keys of the key-board with the valves controlling thereeds whereby each key, as it is depressed,

opens the valve of the reed which is in unison with the note of theinstrument which is sounded in consequence of the depression of thatkey.

At the lower part of the box A of the keyboard there is a space reservedfor the bow d and another for the rosin box 9. The hairs of the bow areprotected and its handle is conveniently placed for the player. It issupported at each extremity by hooks d and d (Fig. 6) attachedunderneath the boxA atits hinder end. The hook d is the one on the righthand of the player. The rosin boxg is hung on a pivot g on the front ofthe keyboard (see Fig. 1 and the dotted lines Fig. 2.)

The box A of the keyboard may be connected to the neck of the instrumentin any suitable manner. A suitable number of pins may be placed upon theneck so as to engage under small bolts 0 fixed underneath the box Fig. land correspondingly distributed throughout its length.

To prevent the bridge G of the strings of the instrument from beingthrown down by the pressure of the dampers p of the keyboard this bridgeis stayed or propped by a support H Figs. 3 and 5 provided with ahook 3.In a brush holder, the combination of a brush holding socket having atransverse guide bearing at the top, a lateral arm projecting from thesocket below the bearing, a vertical adjustable standard at the end ofthe arm, a bifurcation at the top of the standard, a cross-bar, a springcoiled about said cross bar and having its free end extending over thearm and engaging upon the carbon in the guide bearing of the socket, andmeans for adj ustably supporting the socket in the yoke, substantiallyas described.

4. In a brush holder, the combination of the brush socket, the lateralarm projecting therefrom, the standard N slidingly engaging in a bearingat the end of the arm, a spring socured to the side of the arm andhaving a p n engaging in any one of a series of notches in saidstandard, the coil spring S at the top of the standard having theextension S adapted to engage, upon the brush, the parts being arrangedas and for the purpose described.

In testimony whereof I affix my signature in presence of two witnesses.

RODOLPHUS FULLER. \Vitnesses:

Jos. WHITTEMORE, O. F. BARTHEL.

